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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div test="我的是DOM元素test属性里的值">我是标签</div>
</body>
</html>
 
div::after {
  content: attr(test);
  color: red;
}
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